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Scheduling SS-1

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Scheduling SS-1 Scheduling SS-1 BMP Objectives ● Soil Stabilization ● Sediment Control ● Tracking Control ● Wind Erosion Control ● Non-Storm Water Management ● Materials and Waste Management Definition and Purpose This BMP involves developing a schedule for every project that includes sequencing of construction activities with the implementation of construction site BMPs such as temporary soil stabilization (erosion control) and temporary sediment controls measures. The purpose is to reduce the amount and duration of soil exposed to erosion by wind, rain, runoff, and vehicle tracking. Appropriate Applications Any construction project where soils will be disturbed will benefit from a BMP sequencing schedule that is generated in conjunction with the construction-sequencing schedule. BMP sequencing can help minimize land disturbance during construction. Limitations The BMP sequencing schedule must be agreed upon between MDT and the construction contractor. BMP scheduling is only effective if the scheduled is followed closely and modified as required throughout the construction project. Design Guidelines and Considerations n Plan the project and develop an implementation schedule of construction site BMPs. The schedule is designed to clearly show how the BMPs relate to soil-disturbing and re- stabilization activities. The construction schedule is typically incorporated into the SWPPP. n A BMP schedule includes details on the implementation and deployment of: - temporary soil stabilization BMPs, - temporary sediment control BMPs, 10 - tracking control BMPs, - wind erosion control BMPs, - non-storm water BMPs, and - waste management and materials pollution control BMPs. n Also included in the BMP schedule are dates for significant long-term operations or activities that may have planned non-storm water discharges such as dewatering, saw cutting, grinding, drilling, boring, crushing, blasting, painting, hydro-demolition, mortar mixing, bridge cleaning, etc. n Coordinate sequencing and create a timetable for the start and completion of each item such as site clearing and grubbing, grading, excavation, paving, pouring foundations, installing utilities, etc., to minimize the active construction area during the peak storm seasons. n Stabilize non-active areas as soon as practical. n Monitor the weather forecast for rainfall. n When rainfall is predicted, adjust the construction schedule to allow the implementation of soil stabilization and sediment controls on all disturbed areas prior to the onset of rain. n Be prepared year-round to deploy soil stabilization and sediment control practices. Erosion may be caused during dry seasons by unseasonable rainfall, wind, and vehicle tracking. Keep the site stabilized year-round, and retain and maintain sediment trapping devices in operational condition. n Trenching of utility lines is often required on construction projects. Sequence trenching and excavation activities so that most open portions are closed before new trenching or excavations begin. n Incorporate staged seeding and re-vegetation of graded slopes as work progresses. n Consider scheduling when establishing permanent vegetation (appropriate planting time for specified vegetation). n Schedule BMP Maintenance, Inspection, and Removals. Maintenance, Inspection, and Removal n Verify that work is progressing in accordance with the schedule. If progress deviates, take corrective actions. n Amend the schedule when changes are warranted or when directed by the Engineer. n Include anticipated BMP removal information on the schedule. 11 Preservation of Existing Vegetation SS-2 BMP Objectives ● Soil Stabilization ○ Sediment Control ○ Tracking Control ●Wind Erosion Control ○ Non-Storm Water Management ○ Materials and Waste Management Definition and Purpose Preservation of existing vegetation relates to the identification and protection of desirable vegetation. Benefits of preservation of existing vegetation include minimizing disturbance on construction sites, erosion control, detention, and infiltration of storm water, biofiltration, velocity dissipation and aesthetic value. Appropriate Applications n Preserve existing vegetation at areas on a site where no construction activity is planned or where activities may occur at a later date. n Beneficial for use in wetlands, floodplains, stream banks, steep slopes and other areas where erosion controls would be difficult to establish, install, or maintain. n Preservation of existing vegetation is also used to maintain pre-construction drainage patterns to avoid vegetation die off as a result of water flows being intercepted and diverted away from the existing vegetation. n On a year-round basis, temporary fencing can be installed prior to clearing and grubbing operations or other soil-disturbing activities in areas where no construction activity is planned or will occur later. Upon Engineer’s approval, flagging or verbal designation of vegetation preservation areas may be substituted for temporary fencing. n No grading or disturbances occurs in areas identified on the plans to be preserved. n Protection of existing vegetation requires planning, and may limit the area available for construction activities. 12 Design Guidelines and Considerations n Preservation of existing vegetation is best provided prior to the commencement of clearing and grubbing operations or other soil-disturbing activities in areas where no construction activity is planned or will occur later. n Preservation of existing vegetation needs to conform to scheduling requirements set forth in the special provisions. n Mark areas to be preserved with temporary fencing made of orange polypropylene that is stabilized against ultraviolet light. MDT Standard Specifications and Detail Drawings outline the installation of temporary fencing. n Minimize the disturbed areas by locating temporary roadways to avoid stands of trees and shrubs and to follow existing contours to reduce cutting and filling. n Consider the impact of grade changes to existing vegetation and the root zone. n Locate construction materials, equipment storage, and parking areas to minimize root compaction. Staging areas should be selected to avoid negatively impacting large areas of existing vegetation. n Keep equipment away from trees to prevent trunk and root damage. n Maintain existing irrigation systems. n Protective devices are only effective if all personnel understand and honor them. No heavy equipment, vehicular traffic, or stock piles of construction materials shall be permitted within the drip line of trees. Removed trees shall not be felled, pushed, or pulled into any retained trees. Fires shall not be permitted within 30 m (100 ft) of the drip line of any retained trees. No toxic or construction materials - including paint, acid, nails, gypsum board, chemicals, fuels, and lubricants - shall be stored within 15 m (50 ft) of the drip line of any retained trees, nor shall they be disposed of in any way which would injure vegetation. Maintenance, Inspection, and Removal n During construction, clearly marked limits of disturbance should be observable at all times. Irrigate or maintain the existing vegetation in conformance to the requirements in the landscaping plan. If damage to protected trees still occurs, notify the MDT Agronromist and arrange for any repairs. Remove fencing and flagging according to the BMP removal schedule. 13 14 Hydraulic Mulch SS-3 BMP Objectives ● Soil Stabilization ○ Sediment Control ○ Tracking Control ●Wind Erosion Control ○ Non-Storm Water Management ○ Materials and Waste Management Definition and Purpose Hydraulic mulch consists of applying a mixture of small pieces of cellulose fibers that can be made from shredded wood fiber or recycled paper and a stabilizing emulsion and tackifier (if desired) with hydro-mulching equipment. This will protect exposed soil from erosion by raindrop impact or wind. Mulching can also provide protection and warmth for seed growth. Appropriate Applications n Hydraulic mulch is applied to disturbed areas requiring temporary protection until permanent vegetation is established or to disturbed areas that must be re-disturbed. n Avoid use in areas where the mulch would be incompatible with immediate earthwork activities and would have to be removed. n Hydraulic mulch is most effective when used in conjunction with erosion or temporary seeding applications. Limitations n Wood fiber hydraulic mulches are generally short-lived (only last a part of a growing season). n Hydraulic matrices need 24 hours to dry before rainfall occurs to be effective. Design Guidelines and Considerations n Prior to application, roughen embankment and fill areas by rolling with a crimping, punching type roller, or by track walking. Track walking shall only be used where other methods are impractical. n Avoid mulch over-spray onto the traveled way, sidewalks, lined drainage channels, and existing vegetation. 15 n Selection of hydraulic mulches by the Contractor must be approved by the Engineer. n Materials for wood fiber based hydraulic mulches and hydraulic matrices shall conform to MDT Standard Specifications. n Refer to BMP SS-5 (Soil Binder) for tackifier requirements. n Recycled paper mulch must contain 100% post-consumer paper. Hydraulic Mulches n Wood cellulose fiber mulch and recycled paper fiber mulch shall conform to MDT Standard Specifications. n Apply as a liquid slurry using a hydraulic application machine (i.e., hydroseeder). Follow manufacture’s recommendations for application rates, for mulch and stabilizing emulsion, to achieve
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